Optical Isomerism and Order of a Reaction MCQs

By: Prof. Dr. Fazal Rehman | Last updated: November 27, 2024

1. Which of the following is the number of configurational isomers of molecules having (n) different chiral carbons?
(A). 2n
(B). 2n+
(C). 2n-1
(D). 2n+1
(E). None of these
Multiple Choice Question Answer: a

2. For a molecule with two like chiral carbon atoms, which of the following is the number of optically inactive forms?
(A). 3
(B). 2
(C). 1
(D). 4
(E). None of these
Multiple Choice Question Answer: c

3. Which of the following will be the unit of rate constant for the second order reaction?
(A). s-1
(B). Mol0.5 L-0.5 s-1
(C). L mol-1 s-1
(D). Mol L-1 s-1
(E). None of these
Multiple Choice Question Answer: b

4. The order of reaction is _______ if the rate law is given by which of the following?
Rate = k [SO2]1 [SO3]-0.5
(A). 1
(B). 2
(C). 0.5
(D). -0.5
(E). None of these
Multiple Choice Question Answer: c

5. The necessary condition to show the optical activity is the chirality of a molecule completely.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: b

6. An example of optically active compounds without chirality is ______.
(A). Sulfonium salt
(B). Tartaric acid
(C). Diphenic acid
(D). Glyceraldehyde
(E). None of these
Multiple Choice Question Answer: a

7. Not an optically active compound is ______.
(A). 1,7-Dicarboxylic spirocycloheptane
(B). 1,3-Diphenyl propadiene
(C). Glyceraldehyde
(D). Meso-tartaric acid
(E). None of these
Multiple Choice Question Answer: d

8. The Spiranes always exhibit the optical isomerism due to the restricted rotation.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: b

9. The reaction rate is defined as the rate at which what is the concentration of the reactants with time or the concentration of products with time?
(A). Increase, increase
(B). Decrease, increase
(C). Decrease, decrease
(D). Increase, decrease
(E). None of these
Multiple Choice Question Answer: b

10. For a molecule with two like chiral carbon atoms, which of the following is the number of optically active forms?
(A). 2
(B). 3
(C). 1
(D). 4
(E). None of these
Multiple Choice Question Answer: a

11. Which of the following is the number of stereoisomers for CH3 – CHOH – CH = CH – CH3?
(A). 1
(B). 4
(C). 3
(D). 2
(E). None of these
Multiple Choice Question Answer: b

12. The Reaction kinetics deals with the study of which of the following?
(A). All of these
(B). Mechanism of reaction
(C). Factors which affect the rate of reaction
(D). Rate of reaction
(E). None of these
Multiple Choice Question Answer: a

13. Which of the following is the unit of rate of reaction?
(A). Mol L s
(B). Mol L-1 s
(C). Mol L s-1
(D). Mol L-1 s-1
(E). None of these
Multiple Choice Question Answer: d

14. The reaction rate constant may be defined as the rate of the reaction when which of the following is the concentration of every reactant?
(A). Zero
(B). Infinite
(C). Doubled the initial concentration
(D). Unity
(E). None of these
Multiple Choice Question Answer: d

15. Order of the reaction can be zero, fractional, or integer, and we determine it experimentally.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: b

16. Which of the following is the unit s-1 is the unit of rate constant for reaction of the order?
(A). 0
(B). 2
(C). 0.5
(D). 1
(E). None of these
Multiple Choice Question Answer: a

17. The optical isomers that are possible in a compound with one chiral carbon are _______.
(A). 5
(B). 3
(C). 2
(D). 4
(E). None of these
Multiple Choice Question Answer: b

18. The compound that would show optical isomerism is _____.
(A). H2N CH(CH3)2
(B). (CH3)2 CHCHO
(C). CH3 – CH(OH) COOH
(D). H2N CH2 COOH
(E). None of these
Multiple Choice Question Answer: c

19. Which of the following is the unit L mol-1 s-1 is the unit of rate constant for the reaction of the order?
(A). 0.5
(B). 1
(C). 0
(D). 2
(E). None of these
Multiple Choice Question Answer: a

20. The Order of a reaction never gives any information about the reaction mechanism.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: b

21. Optical activity is a property in which a substance is always unable to rotate the plane of the polarization.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: a

22. Which of the following is the number of racemic forms of molecules having (n) different chiral carbons?
(A). 2n
(B). 2n
(C). 2n+1
(D). 2n-1
(E). None of these
Multiple Choice Question Answer: d

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